<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      header {
        width: 100vw;
        height: 10vh;
        background-image: url(./header.png);
        background-size: 100% 100%;
        background-color: rgb(68, 68, 232);
        display: flex;
        justify-content: space-between;
        align-items: center;
      }
      main {
        width: 100vw;
        height: 90vh;
        background-color: lightblue;
      }

      .left {
        width: 30vw;
        height: 90vh;
        background-color: aqua;
      }
    </style>
  </head>
  <body>
    <!-- 宽度用vw，高度用vh，字体用vw -->
    <header>
      <span>天气晴</span>
      <h1>xx平台</h1>
      <span>19：19</span>
    </header>
    <main>
      <div class="left"></div>
      <div class="center"></div>
      <div class="right"></div>
    </main>
  </body>
</html>
